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Method for separating and recovering copper from waste electronic appliances

A technology for separation and recycling of electronic appliances, applied in the chemical industry, can solve problems such as difficult separation, difficult subsequent separation, and high cost, and achieve the effects of facilitating recycling, shortening the process flow, and reducing recycling costs

Inactive Publication Date: 2012-08-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can allow all metal elements to enter the solution at one time, the dissolving operation in aqua regia is difficult, the cost is high, and subsequent separation is also difficult, so it is not suitable for industrial recovery.
(2) Divide into two leaching, first use sulfuric acid plus oxidant or use nitric acid to leach metal elements such as Al, Sn, Pb, Cu, and then use aqua regia to recover gold and other precious metals in the filter residue. This method mainly uses gold and other precious metals as the main purpose. The separation of copper, lead, etc. is difficult, so the method does not fully consider the recycling of metals such as Al, Sn, Pb, Cu, etc.
[0004] In view of the high cost of metal recovery and complex process flow in the existing waste electronics, and the current situation that the recovery of other metal elements is not fully considered except for the most valuable gold recovery, the purpose of the present invention is to provide a low production cost, Quick and easy way to recover copper from WEEE

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Add 1000g of waste electronic blocks (containing 20% ​​copper) to 5 liters of hydrochloric acid solution with a volume concentration of 5%, react at room temperature (20oC) and stirring for 4 hours, and filter; the filtrate is used for separation and recovery of Sn, Pb and other metals .

[0027] 2. Add the filter residue to 3 liters of 30% sulfuric acid solution, and react at 50oC under stirring conditions. During the reaction, every 30 minutes, add 1 liter of hydrogen peroxide with a concentration of 25% in 5 times, and filter after a total reaction of 3 hours. The filter residue is concentrated and used to recover precious metals.

[0028] 3. After the resulting filtrate is evaporated and crystallized to crystalline copper sulfate (CuSO 4 ·5H 2 O) 788g, with a purity greater than 98.5%, meeting the requirements of the copper sulfate process.

Embodiment 2

[0030] 1. Add 500g of metal powder (containing 60% copper) to 2 liters of hydrochloric acid solution with a volume concentration of 15% after sorting waste electronic appliances, react at room temperature (20oC) and stirring for 2 hours, and filter; the filtrate is used for separation and recovery of Sn , Pb and other metals.

[0031] 2. Add the filter residue to 2 liters of 20% sulfuric acid solution, and react at 60oC under stirring conditions. During the reaction, every 30 minutes, add 1.5 liters of hydrogen peroxide with a concentration of 25% in 5 times, and filter after a total reaction of 3 hours. The filter residue is concentrated and used to recover precious metals.

[0032] 3. After electrowinning the filtrate, 300 g of metallic copper was obtained, with a purity greater than 99.5%, meeting the quality requirements for metallic copper.

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Abstract

The invention relates to a method for separating and recovering metal from waste electronic appliances; aiming at the problems of high cost and complicated technological process in the existing metal recovery of waste electronic appliances, and the current situation that except the recovery of most valuable gold, the recovery of other metal elements is not fully considered about, the invention particularly provides a method for separating and recovering copper from the waste electronic appliances, which is low in production cost, quick and simple. According to the method, blocks or powder of the crushed waste electronic appliances, or metal powder which is obtained by sorting the powder is taken as raw material, and hydrochloric acid solution and sulfuric acid solution containing an oxidizing agent are respectively used as leaching reagents, the metal copper is recovered from the raw material by two-step selective leaching, and finally, copper sulfate pentahydrate or metal copper can be obtained.

Description

technical field [0001] The invention relates to a method for separating and recovering metal from waste electronic appliances, in particular to a method for separating and recovering metal copper from waste electronic appliances, which belongs to the technical field of chemical industry. Background technique [0002] With the continuous improvement of science and technology, the speed of upgrading of various electronic products is also accelerating, and the amount of waste of various electronic products is also increasing. The increase in the amount of electronic waste has not only caused a waste of various resources, but also a burden on the natural environment. According to statistics from the China Renewable Resources Association, the value of renewable resources that can be used but not recycled in my country every year reaches 35 billion to 40 billion US dollars. Moreover, with the rapid development of the home appliance and electronics industry, the market scale conti...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/08
CPCY02P10/20
Inventor 张云刘文静
Owner SICHUAN UNIV
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